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I have a samsung refrigertor rs2555sl and my control panel stopped working after I turned the power off to the house (to install a light fixture elsewhere). There was one green light blinking on the refrigerator temp display.

Hold down the "power freeze" and "power cool" buttons at the same time for at least 8 seconds. This is a self diagnostic program. A number should appear on the refrigerator temp display (1-9)...it will hold for 30 seconds and then the panel should function again.

In my case the number that appeared was "3" which can indicate a multitude of things including a short circuit or power outage (which was it was for me).

Sounds like you just need to do a reset, press and hold the top 2 buttons till it flashes then let go. If you hold it to long it will run a diagnostic mode and may lock up on the blinking light again. The blinking light is a trouble indicator for the service tech. It tells them that sensor or heater is faulty or will point them in the right direction. I found a repair manual on the online auction place E b a y that can help you troubleshoot further but have not bought it as of yet. I just purchased my Samsung and was reading some reviews to see what kind of problems i may run in to.

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Transformer TestProcedure:1). Make sure that transformer wireconnections (CON1) to the drive board are secured. Turn unit on.2). Put multimeter to the AC voltage setting. Insert meter probes into the transformer primary (red)wires as shown. Normal reading: 110V. This shows that there is power to the transformer.3). Test transformer output by probing on secondary (output) wires: black and black, white and white,orange and orange, yellow and yellow

Transformer Test Results :1). If there is no voltage across the primary (red) wires, inspect F1 fuse on the drive board and power to the drive board. 2). If there is voltage across primary wires but none across secondary wires, the transformer is bad.Replace it.

Transformer TestProcedure 1). Make sure that transformer wire connections (CON1) to the drive board are secured. Turn unit on.2). Put multimeter to the AC voltage setting. Insert meter probes into the transformer primary (red)wires as shown. Normal reading: 110V. This shows that there is power to the transformer.3). Test transformer output by probing on secondary (output) wires: black and black, white and white,orange and orange, yellow and yellow.Transformer Test Results:1). If there is no voltage across the primary (red) wires, inspect F1 fuse on the drive board and powerto the drive board.2). If there is voltage across primary wires but none across secondary wires, the transformer is bad.Replace it.

High voltage goes to board then to transformer. 24v comes out transformer into board. Check high voltage going to transformer if have votage but no low voltage out other side 24v then transformer is bad.